Word: engineeer
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Lovins praises experiments with hydrogen-powered fuel-cell cars, but he thinks they are only the pace cars for even more advanced models just up the road. As important as the type of power used will be the materials and the overall design. By 2010, he predicts, steel will be...
To scoot around the solar system and return within a few years, you need a spacecraft that will cruise at 100 miles a second. At that speed you will get to Mars in 10 days, to Pluto in 16 months. We can imagine a spacecraft carrying a big area of...
On the other hand, the nearest star is about 10,000 times as far away as Pluto. A trip to the stars within a human lifetime requires a spacecraft that cruises at more than 10,000 miles a second and accelerates to this speed within 10 years. The engine would...
How about unmanned space probes going to the stars? Unmanned probes can be much smaller and lighter than manned spaceships. That means the total power required for a probe to reach the stars is much less. But the unmanned probe still needs an engine delivering one megawatt per pound. The...
Robert Forward, an engineer who used to work for Hughes Aircraft and now works independently, has designed a space probe that might reach the stars, not within this century but a little later. It avoids the problem of cooling the engine by not having an engine. It is a sailing...